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Developer temperature is too low.
Developer in the processor is depleated due to improper replenishment.
Developer in the processor is contaminated by fixer or water.
Developer has been improperly mixed.
Replenishment rates are too low.
Fixer in the processor has been depleted.
Recirculation in the processor has stopped.
Too much starter in the developer in the processor.
Improper safelight.
Expired film is starting to degrade.
Film has been improperly stored or handled.
Developer has oxidized.